This is made from an old IBM laptop [2.5"] hard drive, a Zonet ZEW2500P USB Wireless Adapter, Home Made Antenna thing, USB, Hotglue, and luck.
BE CAREFUL! Some of these old drives, especially the Hitachi - IBM ones use glass platters... these are fragile, sharp and easy to break. The little silver slivers of glass will make your day very bad.
Step 1: Find a drive
The drive is held together with tiny T6 torx screws. I picked up a multi-driver thing at Radio Shack to get them out with, it's handy for cell phones too!
I had to grind some of the inside out, also the motor needs to be removed. I used a socket that the spindle fit inside of and a big hammer with a punch on the back to literally break it off the case. This worked very well, and gave me a lot of space inside to fir the card.